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Loans - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 56,564 | $ 70,426 | $ 80,664
Average recorded investment | 67,070 | 79,496 | 70,762
Interest income recognized | 2,708 | 4,777 | 1,963
Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 18,039 | 20,624 | 30,595
Average recorded investment | 23,154 | 26,821 | 20,179
Interest income recognized | 963 | 885 | 340
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 18,142 | 24,474 | 18,025
Average recorded investment | 21,692 | 22,828 | 17,883
Interest income recognized | 903 | 884 | 550
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 1,324 | 2,226 | 6,720
Average recorded investment | 1,729 | 5,503 | 7,732
Interest income recognized | 64 | 66 | 47
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 19,059 | 23,102 | 25,324
Average recorded investment | 20,490 | 24,341 | 24,968
Interest income recognized | 778 | 2,942 | $ 1,026
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment | $ 5 | $ 3 |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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